crypto/engine/eng_openssl.c

   1 /* crypto/engine/eng_openssl.c */
   2 /*
   3  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* ====================================================================
  60  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  61  * ECDH support in OpenSSL originally developed by
  62  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
  63  */
  64
  65 #include <stdio.h>
  66 #include <openssl/crypto.h>
  67 #include "cryptlib.h"
  68 #include <openssl/engine.h>
  69 #include <openssl/dso.h>
  70 #include <openssl/pem.h>
  71 #include <openssl/evp.h>
  72 #include <openssl/rand.h>
  73 #ifndef OPENSSL_NO_RSA
  74 # include <openssl/rsa.h>
  75 #endif
  76 #ifndef OPENSSL_NO_DSA
  77 # include <openssl/dsa.h>
  78 #endif
  79 #ifndef OPENSSL_NO_DH
  80 # include <openssl/dh.h>
  81 #endif
  82
  83 #include <openssl/hmac.h>
  84 #include <openssl/x509v3.h>
  85
  86 /*
  87  * This testing gunk is implemented (and explained) lower down. It also
  88  * assumes the application explicitly calls "ENGINE_load_openssl()" because
  89  * this is no longer automatic in ENGINE_load_builtin_engines().
  90  */
  91 #define TEST_ENG_OPENSSL_RC4
  92 #define TEST_ENG_OPENSSL_PKEY
  93 /* #define TEST_ENG_OPENSSL_HMAC */
  94 /* #define TEST_ENG_OPENSSL_HMAC_INIT */
  95 /* #define TEST_ENG_OPENSSL_RC4_OTHERS */
  96 #define TEST_ENG_OPENSSL_RC4_P_INIT
  97 /* #define TEST_ENG_OPENSSL_RC4_P_CIPHER */
  98 #define TEST_ENG_OPENSSL_SHA
  99 /* #define TEST_ENG_OPENSSL_SHA_OTHERS */
 100 /* #define TEST_ENG_OPENSSL_SHA_P_INIT */
 101 /* #define TEST_ENG_OPENSSL_SHA_P_UPDATE */
 102 /* #define TEST_ENG_OPENSSL_SHA_P_FINAL */
 103
 104 /* Now check what of those algorithms are actually enabled */
 105 #ifdef OPENSSL_NO_RC4
 106 # undef TEST_ENG_OPENSSL_RC4
 107 # undef TEST_ENG_OPENSSL_RC4_OTHERS
 108 # undef TEST_ENG_OPENSSL_RC4_P_INIT
 109 # undef TEST_ENG_OPENSSL_RC4_P_CIPHER
 110 #endif
 111
 112 #ifdef TEST_ENG_OPENSSL_RC4
 113 static int openssl_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 114                            const int **nids, int nid);
 115 #endif
 116 #ifdef TEST_ENG_OPENSSL_SHA
 117 static int openssl_digests(ENGINE *e, const EVP_MD **digest,
 118                            const int **nids, int nid);
 119 #endif
 120
 121 #ifdef TEST_ENG_OPENSSL_PKEY
 122 static EVP_PKEY *openssl_load_privkey(ENGINE *eng, const char *key_id,
 123                                       UI_METHOD *ui_method,
 124                                       void *callback_data);
 125 #endif
 126
 127 #ifdef TEST_ENG_OPENSSL_HMAC
 128 static int ossl_register_hmac_meth(void);
 129 static int ossl_pkey_meths(ENGINE *e, EVP_PKEY_METHOD **pmeth,
 130                            const int **nids, int nid);
 131 #endif
 132
 133 /* The constants used when creating the ENGINE */
 134 static const char *engine_openssl_id = "openssl";
 135 static const char *engine_openssl_name = "Software engine support";
 136
 137 /*
 138  * This internal function is used by ENGINE_openssl() and possibly by the
 139  * "dynamic" ENGINE support too
 140  */
 141 static int bind_helper(ENGINE *e)
 142 {
 143     if (!ENGINE_set_id(e, engine_openssl_id)
 144         || !ENGINE_set_name(e, engine_openssl_name)
 145 #ifndef TEST_ENG_OPENSSL_NO_ALGORITHMS
 146 # ifndef OPENSSL_NO_RSA
 147         || !ENGINE_set_RSA(e, RSA_get_default_method())
 148 # endif
 149 # ifndef OPENSSL_NO_DSA
 150         || !ENGINE_set_DSA(e, DSA_get_default_method())
 151 # endif
 152 # ifndef OPENSSL_NO_ECDH
 153         || !ENGINE_set_ECDH(e, ECDH_OpenSSL())
 154 # endif
 155 # ifndef OPENSSL_NO_ECDSA
 156         || !ENGINE_set_ECDSA(e, ECDSA_OpenSSL())
 157 # endif
 158 # ifndef OPENSSL_NO_DH
 159         || !ENGINE_set_DH(e, DH_get_default_method())
 160 # endif
 161         || !ENGINE_set_RAND(e, RAND_SSLeay())
 162 # ifdef TEST_ENG_OPENSSL_RC4
 163         || !ENGINE_set_ciphers(e, openssl_ciphers)
 164 # endif
 165 # ifdef TEST_ENG_OPENSSL_SHA
 166         || !ENGINE_set_digests(e, openssl_digests)
 167 # endif
 168 #endif
 169 #ifdef TEST_ENG_OPENSSL_PKEY
 170         || !ENGINE_set_load_privkey_function(e, openssl_load_privkey)
 171 #endif
 172 #ifdef TEST_ENG_OPENSSL_HMAC
 173         || !ossl_register_hmac_meth()
 174         || !ENGINE_set_pkey_meths(e, ossl_pkey_meths)
 175 #endif
 176         )
 177         return 0;
 178     /*
 179      * If we add errors to this ENGINE, ensure the error handling is setup
 180      * here
 181      */
 182     /* openssl_load_error_strings(); */
 183     return 1;
 184 }
 185
 186 static ENGINE *engine_openssl(void)
 187 {
 188     ENGINE *ret = ENGINE_new();
 189     if (!ret)
 190         return NULL;
 191     if (!bind_helper(ret)) {
 192         ENGINE_free(ret);
 193         return NULL;
 194     }
 195     return ret;
 196 }
 197
 198 void ENGINE_load_openssl(void)
 199 {
 200     ENGINE *toadd = engine_openssl();
 201     if (!toadd)
 202         return;
 203     ENGINE_add(toadd);
 204     /*
 205      * If the "add" worked, it gets a structural reference. So either way, we
 206      * release our just-created reference.
 207      */
 208     ENGINE_free(toadd);
 209     ERR_clear_error();
 210 }
 211
 212 /*
 213  * This stuff is needed if this ENGINE is being compiled into a
 214  * self-contained shared-library.
 215  */
 216 #ifdef ENGINE_DYNAMIC_SUPPORT
 217 static int bind_fn(ENGINE *e, const char *id)
 218 {
 219     if (id && (strcmp(id, engine_openssl_id) != 0))
 220         return 0;
 221     if (!bind_helper(e))
 222         return 0;
 223     return 1;
 224 }
 225
 226 IMPLEMENT_DYNAMIC_CHECK_FN()
 227     IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
 228 #endif                          /* ENGINE_DYNAMIC_SUPPORT */
 229 #ifdef TEST_ENG_OPENSSL_RC4
 230 /*-
 231  * This section of code compiles an "alternative implementation" of two modes of
 232  * RC4 into this ENGINE. The result is that EVP_CIPHER operation for "rc4"
 233  * should under normal circumstances go via this support rather than the default
 234  * EVP support. There are other symbols to tweak the testing;
 235  *    TEST_ENC_OPENSSL_RC4_OTHERS - print a one line message to stderr each time
 236  *        we're asked for a cipher we don't support (should not happen).
 237  *    TEST_ENG_OPENSSL_RC4_P_INIT - print a one line message to stderr each time
 238  *        the "init_key" handler is called.
 239  *    TEST_ENG_OPENSSL_RC4_P_CIPHER - ditto for the "cipher" handler.
 240  */
 241 # include <openssl/rc4.h>
 242 # define TEST_RC4_KEY_SIZE               16
 243 static const int test_cipher_nids[] = { NID_rc4, NID_rc4_40 };
 244
 245 static const int test_cipher_nids_number = 2;
 246 typedef struct {
 247     unsigned char key[TEST_RC4_KEY_SIZE];
 248     RC4_KEY ks;
 249 } TEST_RC4_KEY;
 250 # define test(ctx) ((TEST_RC4_KEY *)(ctx)->cipher_data)
 251 static int test_rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 252                              const unsigned char *iv, int enc)
 253 {
 254 # ifdef TEST_ENG_OPENSSL_RC4_P_INIT
 255     fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) test_init_key() called\n");
 256 # endif
 257     memcpy(&test(ctx)->key[0], key, EVP_CIPHER_CTX_key_length(ctx));
 258     RC4_set_key(&test(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
 259                 test(ctx)->key);
 260     return 1;
 261 }
 262
 263 static int test_rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 264                            const unsigned char *in, size_t inl)
 265 {
 266 # ifdef TEST_ENG_OPENSSL_RC4_P_CIPHER
 267     fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) test_cipher() called\n");
 268 # endif
 269     RC4(&test(ctx)->ks, inl, in, out);
 270     return 1;
 271 }
 272
 273 static const EVP_CIPHER test_r4_cipher = {
 274     NID_rc4,
 275     1, TEST_RC4_KEY_SIZE, 0,
 276     EVP_CIPH_VARIABLE_LENGTH,
 277     test_rc4_init_key,
 278     test_rc4_cipher,
 279     NULL,
 280     sizeof(TEST_RC4_KEY),
 281     NULL,
 282     NULL,
 283     NULL,
 284     NULL
 285 };
 286
 287 static const EVP_CIPHER test_r4_40_cipher = {
 288     NID_rc4_40,
 289     1, 5 /* 40 bit */ , 0,
 290     EVP_CIPH_VARIABLE_LENGTH,
 291     test_rc4_init_key,
 292     test_rc4_cipher,
 293     NULL,
 294     sizeof(TEST_RC4_KEY),
 295     NULL,
 296     NULL,
 297     NULL,
 298     NULL
 299 };
 300
 301 static int openssl_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 302                            const int **nids, int nid)
 303 {
 304     if (!cipher) {
 305         /* We are returning a list of supported nids */
 306         *nids = test_cipher_nids;
 307         return test_cipher_nids_number;
 308     }
 309     /* We are being asked for a specific cipher */
 310     if (nid == NID_rc4)
 311         *cipher = &test_r4_cipher;
 312     else if (nid == NID_rc4_40)
 313         *cipher = &test_r4_40_cipher;
 314     else {
 315 # ifdef TEST_ENG_OPENSSL_RC4_OTHERS
 316         fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) returning NULL for "
 317                 "nid %d\n", nid);
 318 # endif
 319         *cipher = NULL;
 320         return 0;
 321     }
 322     return 1;
 323 }
 324 #endif
 325
 326 #ifdef TEST_ENG_OPENSSL_SHA
 327 /* Much the same sort of comment as for TEST_ENG_OPENSSL_RC4 */
 328 # include <openssl/sha.h>
 329 static const int test_digest_nids[] = { NID_sha1 };
 330
 331 static const int test_digest_nids_number = 1;
 332 static int test_sha1_init(EVP_MD_CTX *ctx)
 333 {
 334 # ifdef TEST_ENG_OPENSSL_SHA_P_INIT
 335     fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_init() called\n");
 336 # endif
 337     return SHA1_Init(ctx->md_data);
 338 }
 339
 340 static int test_sha1_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 341 {
 342 # ifdef TEST_ENG_OPENSSL_SHA_P_UPDATE
 343     fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_update() called\n");
 344 # endif
 345     return SHA1_Update(ctx->md_data, data, count);
 346 }
 347
 348 static int test_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
 349 {
 350 # ifdef TEST_ENG_OPENSSL_SHA_P_FINAL
 351     fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_final() called\n");
 352 # endif
 353     return SHA1_Final(md, ctx->md_data);
 354 }
 355
 356 static const EVP_MD test_sha_md = {
 357     NID_sha1,
 358     NID_sha1WithRSAEncryption,
 359     SHA_DIGEST_LENGTH,
 360     0,
 361     test_sha1_init,
 362     test_sha1_update,
 363     test_sha1_final,
 364     NULL,
 365     NULL,
 366     EVP_PKEY_RSA_method,
 367     SHA_CBLOCK,
 368     sizeof(EVP_MD *) + sizeof(SHA_CTX),
 369 };
 370
 371 static int openssl_digests(ENGINE *e, const EVP_MD **digest,
 372                            const int **nids, int nid)
 373 {
 374     if (!digest) {
 375         /* We are returning a list of supported nids */
 376         *nids = test_digest_nids;
 377         return test_digest_nids_number;
 378     }
 379     /* We are being asked for a specific digest */
 380     if (nid == NID_sha1)
 381         *digest = &test_sha_md;
 382     else {
 383 # ifdef TEST_ENG_OPENSSL_SHA_OTHERS
 384         fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) returning NULL for "
 385                 "nid %d\n", nid);
 386 # endif
 387         *digest = NULL;
 388         return 0;
 389     }
 390     return 1;
 391 }
 392 #endif
 393
 394 #ifdef TEST_ENG_OPENSSL_PKEY
 395 static EVP_PKEY *openssl_load_privkey(ENGINE *eng, const char *key_id,
 396                                       UI_METHOD *ui_method,
 397                                       void *callback_data)
 398 {
 399     BIO *in;
 400     EVP_PKEY *key;
 401     fprintf(stderr, "(TEST_ENG_OPENSSL_PKEY)Loading Private key %s\n",
 402             key_id);
 403     in = BIO_new_file(key_id, "r");
 404     if (!in)
 405         return NULL;
 406     key = PEM_read_bio_PrivateKey(in, NULL, 0, NULL);
 407     BIO_free(in);
 408     return key;
 409 }
 410 #endif
 411
 412 #ifdef TEST_ENG_OPENSSL_HMAC
 413
 414 /*
 415  * Experimental HMAC redirection implementation: mainly copied from
 416  * hm_pmeth.c
 417  */
 418
 419 /* HMAC pkey context structure */
 420
 421 typedef struct {
 422     const EVP_MD *md;           /* MD for HMAC use */
 423     ASN1_OCTET_STRING ktmp;     /* Temp storage for key */
 424     HMAC_CTX ctx;
 425 } OSSL_HMAC_PKEY_CTX;
 426
 427 static int ossl_hmac_init(EVP_PKEY_CTX *ctx)
 428 {
 429     OSSL_HMAC_PKEY_CTX *hctx;
 430     hctx = OPENSSL_malloc(sizeof(OSSL_HMAC_PKEY_CTX));
 431     if (!hctx)
 432         return 0;
 433     hctx->md = NULL;
 434     hctx->ktmp.data = NULL;
 435     hctx->ktmp.length = 0;
 436     hctx->ktmp.flags = 0;
 437     hctx->ktmp.type = V_ASN1_OCTET_STRING;
 438     HMAC_CTX_init(&hctx->ctx);
 439     EVP_PKEY_CTX_set_data(ctx, hctx);
 440     EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
 441 # ifdef TEST_ENG_OPENSSL_HMAC_INIT
 442     fprintf(stderr, "(TEST_ENG_OPENSSL_HMAC) ossl_hmac_init() called\n");
 443 # endif
 444     return 1;
 445 }
 446
 447 static int ossl_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 448 {
 449     OSSL_HMAC_PKEY_CTX *sctx, *dctx;
 450     if (!ossl_hmac_init(dst))
 451         return 0;
 452     sctx = EVP_PKEY_CTX_get_data(src);
 453     dctx = EVP_PKEY_CTX_get_data(dst);
 454     dctx->md = sctx->md;
 455     HMAC_CTX_init(&dctx->ctx);
 456     if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
 457         return 0;
 458     if (sctx->ktmp.data) {
 459         if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
 460                                    sctx->ktmp.data, sctx->ktmp.length))
 461             return 0;
 462     }
 463     return 1;
 464 }
 465
 466 static void ossl_hmac_cleanup(EVP_PKEY_CTX *ctx)
 467 {
 468     OSSL_HMAC_PKEY_CTX *hctx;
 469     hctx = EVP_PKEY_CTX_get_data(ctx);
 470     HMAC_CTX_cleanup(&hctx->ctx);
 471     if (hctx->ktmp.data) {
 472         if (hctx->ktmp.length)
 473             OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
 474         OPENSSL_free(hctx->ktmp.data);
 475         hctx->ktmp.data = NULL;
 476     }
 477     OPENSSL_free(hctx);
 478 }
 479
 480 static int ossl_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 481 {
 482     ASN1_OCTET_STRING *hkey = NULL;
 483     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
 484     if (!hctx->ktmp.data)
 485         return 0;
 486     hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
 487     if (!hkey)
 488         return 0;
 489     EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
 490
 491     return 1;
 492 }
 493
 494 static int ossl_int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 495 {
 496     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx->pctx);
 497     if (!HMAC_Update(&hctx->ctx, data, count))
 498         return 0;
 499     return 1;
 500 }
 501
 502 static int ossl_hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
 503 {
 504     EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
 505     mctx->update = ossl_int_update;
 506     return 1;
 507 }
 508
 509 static int ossl_hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig,
 510                              size_t *siglen, EVP_MD_CTX *mctx)
 511 {
 512     unsigned int hlen;
 513     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
 514     int l = EVP_MD_CTX_size(mctx);
 515
 516     if (l < 0)
 517         return 0;
 518     *siglen = l;
 519     if (!sig)
 520         return 1;
 521
 522     if (!HMAC_Final(&hctx->ctx, sig, &hlen))
 523         return 0;
 524     *siglen = (size_t)hlen;
 525     return 1;
 526 }
 527
 528 static int ossl_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 529 {
 530     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
 531     EVP_PKEY *pk;
 532     ASN1_OCTET_STRING *key;
 533     switch (type) {
 534
 535     case EVP_PKEY_CTRL_SET_MAC_KEY:
 536         if ((!p2 && p1 > 0) || (p1 < -1))
 537             return 0;
 538         if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
 539             return 0;
 540         break;
 541
 542     case EVP_PKEY_CTRL_MD:
 543         hctx->md = p2;
 544         break;
 545
 546     case EVP_PKEY_CTRL_DIGESTINIT:
 547         pk = EVP_PKEY_CTX_get0_pkey(ctx);
 548         key = EVP_PKEY_get0(pk);
 549         if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, NULL))
 550             return 0;
 551         break;
 552
 553     default:
 554         return -2;
 555
 556     }
 557     return 1;
 558 }
 559
 560 static int ossl_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
 561                               const char *type, const char *value)
 562 {
 563     if (!value) {
 564         return 0;
 565     }
 566     if (!strcmp(type, "key")) {
 567         void *p = (void *)value;
 568         return ossl_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
 569     }
 570     if (!strcmp(type, "hexkey")) {
 571         unsigned char *key;
 572         int r;
 573         long keylen;
 574         key = string_to_hex(value, &keylen);
 575         if (!key)
 576             return 0;
 577         r = ossl_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
 578         OPENSSL_free(key);
 579         return r;
 580     }
 581     return -2;
 582 }
 583
 584 static EVP_PKEY_METHOD *ossl_hmac_meth;
 585
 586 static int ossl_register_hmac_meth(void)
 587 {
 588     EVP_PKEY_METHOD *meth;
 589     meth = EVP_PKEY_meth_new(EVP_PKEY_HMAC, 0);
 590     if (!meth)
 591         return 0;
 592     EVP_PKEY_meth_set_init(meth, ossl_hmac_init);
 593     EVP_PKEY_meth_set_copy(meth, ossl_hmac_copy);
 594     EVP_PKEY_meth_set_cleanup(meth, ossl_hmac_cleanup);
 595
 596     EVP_PKEY_meth_set_keygen(meth, 0, ossl_hmac_keygen);
 597
 598     EVP_PKEY_meth_set_signctx(meth, ossl_hmac_signctx_init,
 599                               ossl_hmac_signctx);
 600
 601     EVP_PKEY_meth_set_ctrl(meth, ossl_hmac_ctrl, ossl_hmac_ctrl_str);
 602     ossl_hmac_meth = meth;
 603     return 1;
 604 }
 605
 606 static int ossl_pkey_meths(ENGINE *e, EVP_PKEY_METHOD **pmeth,
 607                            const int **nids, int nid)
 608 {
 609     static int ossl_pkey_nids[] = {
 610         EVP_PKEY_HMAC,
 611         0
 612     };
 613     if (!pmeth) {
 614         *nids = ossl_pkey_nids;
 615         return 1;
 616     }
 617
 618     if (nid == EVP_PKEY_HMAC) {
 619         *pmeth = ossl_hmac_meth;
 620         return 1;
 621     }
 622
 623     *pmeth = NULL;
 624     return 0;
 625 }
 626
 627 #endif